Mechanisms of Tunnel Rockburst Development Under Complex Geostress Conditions in Plateau Regions
Source abstract
Abstract
The Qinghai–Xizang Plateau and its surrounding regions have experienced intense tectonic activity, resulting in complex geostress environments that cause frequent and distinctive rockburst disasters in plateau tunnel engineering. In this study, numerical simulations were conducted to investigate the distribution characteristics and patterns of tunnel rockbursts in high-altitude regions, using geostress orientation, lateral pressure coefficient, and tunnel depth as the primary independent variables. Secondary development of FLAC3D 7.00.126 was carried out using FISH language to enable the recording and visualization of tangential stress, the Russense rockburst criterion, and elastic strain energy. Based on this, the influence mechanisms of these key geostress parameters on the location, extent, and intensity of rockbursts within tunnel cross sections were analyzed. Results indicate that geostress orientation predominantly affects the location of rockbursts, with the surrounding rock in the direction of the minimum principal stress on the tunnel cross section being particularly prone to rockburst risks. The lateral pressure coefficient primarily influences the rockburst intensity and pit range within local stress concentration zones, with higher values leading to greater rockburst intensity. Notably, when structural stress is sufficiently large, rockbursts may occur even in tunnels with shallow burial depths. Tunnel depth determines the magnitude of geostress, mainly affecting the overall risk and potential extent of rockbursts within the cross section, with greater depths leading to higher rockburst intensities and a wider affected area.
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Research context
OpenAlex topics: Rock Mechanics and Modeling · Landslides and related hazards · Geotechnical Engineering and Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Engineering, Xizang University, Lhasa 850000, China
Plateau Major Infrastructure Smart Construction and Resilience Safety Technology Innovation Center, Lhasa 850000, China
Changjiang River Scientific Research Institute, Wuhan 430010, China
College of Civil Engineering, Tongji University, Shanghai 200092, China
Funding
Natural Science Foundation of Xizang Autonomous Region · National Natural Science Foundation of China · Xizang Autonomous Region Science and Technology Plan “Open bidding for selecting the best candidates” Project · Central Government · Basic Research Operating Fund Program for Public Welfare Research Institutes at the Central Level
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